Concrete conveyer



April 27, 1937. A. E. L UNDBYE 2,078,863

CONCRETE CONVEYER Filed May 25, 1955 6 sheets-sheet 1 April 27, 1937.

A. E.. LUNDBYE CONCRETE CONVEYER Filed May 25, 1935 6 SheetS-Sheel'l 2Axel 21.12%@

April 27,1937- A. E. LUNDBYE 2,078,863

v CONCRETE CONVEYER Filed May 25,. 1955 e sheets-sheet April 27, 1937.A. E. LUNDBYE CONCRETE CONVEYERl Filed May 25, 1955 i 6 Sheets-Sheet 4www,

April 27, 1937 A. E. I UNDBYE 2,078,863

CONCRETE CONVEYER Filed May 25, 1935 G Sheets-Sheet 5 April 27, 1937. A.E, I UNDBYE CONCRETE CONVEYER Filed May 25, 1935 y6 sheets-sheet 6 VAll)Patented Apr. 27,y 1937 UNITED vSTATES PATENT orrlfce 1 Foote Company,Inc.,

tion of Delaware Application May 25,

' 4 Claims.

My invention relates to new and useful improvements in concrete pavers,and more particularly to the means of conveying the concrete from themixing drum to its point of discharge 5 at any desired position alongthe boom.

As is well known to those skilled in the paving art, the aggregates,with the exception of what is known as the ready mix, are' generallyele- .vated by a skip to the drum of the paver, and after beingthoroughly mixed are discharged into a bucket that travels outwardly onthe boom and, in turn, discharged from the bucket at any predeterminedpoint by the operator of the paver.

Also, as is well known, the boom and bucket method of dischargesucceeded the previous method of discharging concrete from a paver bymeans of a relatively short chute that was traversed by the operator todischarge over a rather small radius. l r At the present time, thetendency is to make the concrete pavers of greater capacity and thedistribution of the concrete by the boom and bucket method presentscertain diiliculties as, for instance, a lengthy boom is necessarilyheavy J and when a large Vcapacity bucket is filled With concrete andrun out along the boom to its outer end there is a possibility of thepaver becoming unstable. o Again, due to the extra capacity now of thedrum, valuable time is lost in the delivery, that is, waiting after thebucket is emptied for the return of the bucket to a position under thedischarge chute of the -paver for another load. One of the objects ofthe present invention, u" therefore, is to provide a concrete paver withan endless form of belt conveyer with the addition of what'I term adischarge carriage and to so arrange the endless conveyer, the dischargecarriage, and its other associated parts that the aggregates may becontinuously discharged from the drum (after being properly mixed),carried on a conveyer'belt to the discharge carriage, and from` whichcarriage they will be delivered through a hopper to either or both sidesof the boom. Provision is also made so that the discharge carriage maybe positioned at any point along the boom `for discharging theaggregates rather than only at the end of the boom.

Still another object of the invention is to provide a form of endlessconveyer together with a` movable discharge carriage that may be positionedat any point throughout the length of the boom, so that thedischarge from the drum 55 may be continuous, that is,` aiter each batchNunda, N. Y., a corpora- 1935, Serial No. 23,490

either side of the boom and over a greater amount of sub-grade than isotherwise possible, thus doing away with the necessity of having severalmen shovel the concrete after the same has been discharged from theordinary style bucket.

Still another object of the invention is to provide a form of endlesscarrier and distributing means wherein the discharge carriage may bequickly run out to a desired position by the operator and the endlessconveyer discharge into and from this carriage in a rapid manner.

Still another object of the invention is to provide a form of endlessconveyer belt, a discharging carriage, and a boom, which latter isuniversally mounted with respect to the paver, there also being a formof what might be termed transmission or power operating means drivenfrom the engine of the paver which makes it possible and convenient toquickly traverse the `boom and drive the conveyer belt, the carriage,

and the other associated parts of the conveyer.

Still another object of the invention is to provide a form of endless.conveyer belt and discharge carriage and to provide means for scrapingor cleaning the belt as it travels, the scraping action taking placeimmediately after the materials have been discharged from the conveyerand again out at the end of the boom, so that the aggregates have nochance to harden or stick to the conveyer belt;

Still another object of the inventionxis to pro` vide means forconveniently carrying out 'these several functions by the operator ofthe paver to thereby provide what might be termed flexibil ity to themachine.

With these and other objects in View, the inven-V tion consists incertain new and novel features and combination of parts, as will behereinafter more fully explained and pointed out in the claims. I

Referring now to the drawings showing a preferred embodiment,

Fig. 1 is a side elevation of my improved endless conveyer provided witha cooperating movable delivery carriage;

Fig. 2 is a top plan view thereof;

Fig. 3 is an enlarged end elevation, partly in section to show themanner of distribution of the material from the discharge carriage tothe oppositely arranged chutes;

Fig. 4 is an enlarged top plan of the rear end of the conveyer andshowing the various operating mechanisms;

Fig. 5 is a side elevation of the same;

Fig. 6 is an enlarged transverse vertical sectional view on the line 6-6of Fig. 5;

Fig. '7 is an enlarged fragmentary top plan view showing the adjustabledischarge carriage and delivery chute and some of the associated parts;

Fig. 8 is a side elevation thereof and showing the means by which thebelt is scraped during its travel;

Fig. 9 is an enlarged fragmentary plan View of the outer end of theconveyer and its associated parts;

Fig. 10 is a side elevation thereof and showing further means forscraping the belt during its travel;

Fig. 11 is a fragmentary detail showing the driving means for thescraper;

Fig. 12 is a fragmentary transverse vertical section of the conveyer andits supporting means taken on the line I2--I2 of Fig. 9.

Referring now to the drawings, and more particularly to Figs. 1 and 2for the moment,

Y there is shown fragmentarily a paver I, a portion of the bottom of theframe 2, the upright portion 3 of the frame, and a portion of the topframe 4. There may also be seen, fragmentarily, a portion of the mixingdrum 5. The paver per se forms no part of the present invention but itis of the well-known Foote type as shown in several patents, to wit:1,443,354, of January 30, 1923, granted to Charles E. Foote and1,478,945, of December 25, 1923, granted to Charles E. Foote.

It will be noticed that there is a boom 6, but this type of boom is notconventional to the above Foote patents and does not carry a bucket ofany of the well-known types that are generally associated with the boomsof concrete payers. The boom consists primarily of two channel beams 1,as may be seen from Fig. 3, while mounted on the boom is a carriage 9,which carriage will be explained more in detail as the specicationproceeds.

It will be understood that there will be the necessary cross braces forthe boom, and the inner end (the inner end being the end adjacent thepaver) is supported on what I term` a transmission mechanism which islocated centrally of the paver I and directly beneath the spout i3,which spout extends into the drum of the paver and also into anauxiliary boot II, which boot extends over the conveyer, as will behereinafter described. The transmission mechanism, in turn, is mountedon the beamsy 8 forming part of a drop frame I2 permanently aflixed tothe front of the paver frame, the members I2 being suitably attached tothe standards 3. This arrangement forms a drop seat or platform for themounting of the casing I4 which, in turn, supports the pivotal end ofthe boom 6.

This present form of transmission mechanism makes it possible to elevateand to traverse the boom and to operate the conveyer from the power thatoperates the paver. The transmission per se forms the subject matter ofa companion application and will be described here in a general mannerrather than specifically.

Referring again for the moment to Figs. l, 4, 5, and 6, there will benoticed a main power shaft I3 which, in turn, is driven from the motivepower (not shown) mounted on the paver. This power shaft I3 extendswithin the casing I 4 of the transmission box and is provided at its endwith a pinion I5, which, inturn, meshes With the bevel gear I6, which ismounted at the end of the vertical shaft I'I, which shaft extendsthrough the bearing I8, and which bearing, in turn, has the integralupper plate I9 from which extends downwardly the flange 2D. This ange20, in turn, has secured thereto the gear 2| by bolts 22, the gear, inturn, located above the plate 23 of the housing I4, which latter isbolted, as at 24, to the extension housing 25 of the housing I4 of thetransmission box. The lower surface 26 of the m-ain housing 25 of thetransmission box or casing is secured by bolts 2'I to the aforementionedchannels 8.

Also located on the top plate I9 is a further housing 28, which formsthe rotatable part of the transmission housing, through which passes thetransversely extending power shaft 29. This power shaft 29 is driven bythe bevel gear 33 meshing with its mate 3| mounted on the upper end ofthe vertical shaft I'I. The shaft 29 is suitably mounted in bearings 32near the outer end `of the shaft and on each end there is provided asprocket 33, each of which is provided with a chain 34 to, in turn, meshwith sprockets 35 that are mounted on the ends of the drum shaft 36, onwhich shaft there is the drum 3i that drives the conveyer belt 38.

As far as the specication has proceeded, therefore, it will be seen thatthe power derived from the rotation of the shaft 6 is directed throughthe various pinions and shafts and sprockets and chains to operate theconveyer drum 3'! and, in turn, the endless conveyer 38.

Also, by mounting the vertical drive shaft I'I in the housing I8 which,in turn, is rotatable in its casing, it will be seen that the boom iscapable of traverse about the vertical axis coincident with the verticalshaft il.

Mechanical means are provided for traversing the boom, and if referenceis made to 4 and 5 there will be seen on the power shaft I3 a sprocket39 provided with a sprocket chain 40 which, in turn, actuates thesprocket 4I mounted on the shaft 42. This shaft 42 is only fragmentarilyshown and, of course, there will be the necessary bearings provided. Onthe end 5 of the shaft 42 is the pinion 43 to operate the place clutch44 which is made up of the two usual mitre gears 45 and 45 which areloosely mounted on the shaft 46. These mitre gears are provided with theinterlocking face means (not shown) that may mesh with the shift collar4l which is locked to the shaft 46, so that the shaft 45 and its worm 48may be revolved in either direction, according to which mitre gear islocked to the shaft. Shifting means 48 are provided for selectivelyengaging either one of the mitre gears to be revolved by the pinion,depending on Whether the boom is to be traversed to the right or to theleft. The worm 48, of course, meshes with the aforementioned segmentalgear 2l, as will be understood from the several views. It will also beseen that the main power shaft I3 also furnishes the power fortraversing the boom.

Now means for elevating the boom are also material.

shown; and! although:A I have slf'rowmtl-1e-v means for manually`elevating andi. lower-ingr the boom itr isA withini the@ province; ofithreinventionv tome oha-nically: cpenate the. same?.

Referring: for the moment to Figs., 1 andi 2; there` iss showm mountedon the.` main', frame;A of the: paverz' aw. transverse? shaft? isisuitably mount ed in: bearings-i in. wliilegmountednear; the op:- positsends of; the shaft i 5l areftheftwor Worms 5l; which, in:- tu1tn,.respectivelymesh with; Worm gearsf-v tra; mountedf. on: theirrespect-ive;- drumsAv 553;." Separate cab-les extend? from@ these drumsto: the. for-ward; end of the-l boom.

Qn: the front of the machineandz at the. top thereof` ispivotallymounted ai. bracket arnn 5dr with A the outer bearings 515;through.- which; passes.- a rod 55, and on the outer endsfofi this rod:-arethelinks; 5il-. Held; by theflinlrs.F 531;, than. is. on, each, side`or. the` boom:V are.` the sheavest bil; an-dextending, overthese:sheaves are the re spective cables- As. the; cables' are. alike,l a.description-of one will beadescriptionofiboth The cable 59 extendsforrwardlyf-fromjhedrum 53. over one-.ofthe two sheavesv 58andthenceftothe encLof the boomfandover.. thefsheavell. heldby.v thelinks 5l, which 1inksin turnrarevsecuredlto the crossl rod. 62. at.vthe. outer` 'end-3 oi the.. boom.. The cable. is then: returned; and.passesN o ver.: the; othen ci, the sheaves., 58.1. and.. thenceforwardly again.. and.. fastened. to. a. fixed. arm- Bil ,l formedlon..

the, link. El.. This; arrangement isduplicated. on. the opposite side ofthe boom so that wherrthe. hand wheel B3 is operatedtheftwo drums 53will 'be wound or unwound in unison, depending, of

course, upon.. the directiony off rotationi of? the the conveyenbeltandi also* the. under` roller,y 64?'.

The belt? maybe offabric, rubbem-onotherdesired? There is also providedat the outer'endz of-theiboomadrum or roller whicheiscmounted onitfheshaft 66, whchfshaft, irr turn,.is;mounted in* bearingblocks-(fflon:th'e"boom.K Thesefbearingr, blocks`A are adjustable` so`that-theA proper tensioni 4 may bepl'aced. on theconveyer beltlattalltimes;

By glancingat-IFi'gss 11 andf2, howeverpitrwill'be noticed 'that thev-conveyer 38-doesinots runldireotly from the inner-` drum STI to theLouter'- drum: G5; but, in turn, passes-1upward1`y and sthr-eadedzl aboutaL dischargeoarriage ilE ands then: outwardlyto thelendi of the boom'andi over` the. outer roller,` and' then back to the innerdrume Thisdischarge, carriage if` may be-seeni in `fdetail in,` Figs; '7i andi 8and itsprovision makes it possible to; dischargeV the aggregatesA atam7j desiredi placey along? the: boom rather than conveying the materialt'o.- the' end offthe boom; whi'chisfthe practice =of=``ordinary endlessconveyers.

The discharge carriage consi'stsa of the side f frames 69`Yw-hich aremounted? on thewheels: 10;

Y wardly; as atl T4; to their outer ends-75: The forv` ward ends-`offt'he side -framesl-rareicuti-out, asratY li to,A inreality;forrn-the-legs l1? andi alsoia leg 1&3 which latter extends:forwardly-outfoverthe fore- 1, ward` wheels.` Mounted# on: the upperAsurface; off

the. carriage: El isshown. a1. roilen'- 'litirsimilarA to: the rollers`thats exterrd along; thee entire? boom: for the supportofitheibelt'convey-en;

Now before explaining: howsV theoonveyer' is threadedf thrnugl'r` theAcarriage; reference` will be made t'o. what l2 term-f the` carriage-idischarge hopper- 80, Whichzformsf-z aipartl. oflithe discharge`carriageg. and-2 this hoppen may: be#V seen also inA detail. in Fig: 3i'This hoppenis-.secured-r toA the forward armssoffthe carriageandiconsist'scof-fwhat' might: be termed the bodyportion, 8h. Its -flower end is=. bifuroat'ed to-y form: the two separatebrancl1es=-3-2`fandi8i (Eigz .3 i, .which-extend laterali-- lyrof thexboomiandv. outwardly l'to' a. position. about'.v in"` line'. with. thecater-pillar:l tractors 34?' ofA thef paver;

It: will. bev noticed-i than the hopper ili is;v open attits: rear;.thaty isi. in; the? upper- `portion 8 I; Yas: at 855. and: extending:transversely of.` the hopper: is theeslrafft.at;MMountedionf.thisshaftriszthe drum' or; roilera: 8.1 over' which. theryendless: conveyerv is: passed; Iovapointatfthe rear'ofgtherlhopperfand.Onthe carriage; mountedii'n, the?V side'. frames: of: theasame,isaanotherfshaftaomwhiclnismounted:` drum; or` roller; 89;. so: that.vthe; endless conveyer belt, elften-passingfoventhexdrumiinxthe' topfJofi` the; hoppen will*` again extends Vrea-nwardly arounditl'neeroller.W 89T of:` the. car-1i age: and; their. exe tendioutyvardiyandoyenthet-idlersiuntil-itreaches the; drurrn 6.5i mounted; att the fforward: end'. of the boom. Of.c.ourse;.from this. pcint. the conveyer:beltz exbendsirearmardlyrtot the druml 3l mounted at; theA innen4 endofi thefzboom. over. theddlers 64! It might; be; mentioned here: that:regardless o wherefthefcarriagefisz-nositionedl alongtlfrepboorn;

the length? of the-conveyenbe-lt-will? always `renfiaiuiconstant-.softhatz-it;isanotneoessaryf-to@use longer onshortenbeltsewhichi mightothenwisebe thev Calset Referring. for: themomenti to.-

3;. it,V willf. be. noticedfthatl. have@provided?.means.w to ldirect theaggregates .from-.the .hopper either. into` the branch 8.1.01'.r into`thel :branch-.85m55- the provision-of a-Y gatel0.`.oner.atingpfrom.the;shaft. 9J ,.whiclfnmay-be providedon-its-.outer end; vvitlfi= ai handle92;. The swinging` of this, gate inone. direction; will,` of" course.direct. the. aggregates to:- the branch. in the; opposite direction,so..` that the4 concrete. may be. equally. wellz disposed: to eitherside of.. the boom. Or, if desiredthe gate-couldbe placed: in. avertical. positionto: direct the aggregates to both sd'esat the sametime.A

Whent an. endless. form` of. coni/eyer. is, usedfor. the@ disposition.of. concrete, unless. some.. provi.- sion. is made. for cleaning,thebelt. the` aggregates` are likely toA harden-.onthe belt and,continue to build; 11p-untill they affect. the normal. operation ofthebelt; lhavatherefore, providedtwoseparate means for` cleaning or.scraping. the upper surface of. th'ebelt throughout. the. entire operaftion of 'the same; B'y referring for. themoment to Figs.. 1 and 3, therewill be seen located directly beneath the shaftl Shin the. hopper asecond.

shaft @Si which is suitably mounted ink bearings 923, while at* the oneend 9.5" there may be seen a sprocket' Stia-nda chain'l",whichlatterextends to' a' sprocket'. 98 mountedA on' the" endl QQ of'theA shaft 85; f

ANow mountedI onthis'shaft 93T- anddirectiy beneaththedrum 8!- a-nd-inContact: therewith may be seenV ascr-apen |100" which may be provided"withVK helioallyishapedblades: isi-lf, which conta-cti with: theouter-surfac'el of the beltiandion. which surface,` ofi course; theconcrete. has. been car-- ried. It-will be-understood that. the endlesscon-J veyer rotates the drum 81 by its movement thereon and power, ofcourse, is derived from the shaft supporting this drum to the scraperthrough the chain and sprockets just mentioned.

In the same manner, a further scraper |02 is provided at the outer endof the boom and the driving arrangement may be seen in detail in Fig.1l. In this instance, there is a sprocket |03 mounted on the one end ofthe shaft 66, over which passes the chain |04 to operate the sprocket|05 mounted on a shaft |06, which shaft is supported in the bearings |01mounted on the under sides of the channel beams 1, and on which shaft isthe helically-bladed scraper |02. This drum 65 is what might be termedan idler drum, but it is driven by the movement of the conveyer beltwhich, in turn, through the chain and sprockets just-mentioned operatesthis scraper |02. The scraper is mounted directly beneath theaforementioned drum 05, so that any of the aggregates that were notremoved by the scraper |00 will be removed by the scraper |02 mounted atthe outer end of the boom. Thus, the belt is always kept clean and theaggregates are prevented from hardening on the belt during times whenthe belt is not in operation.

I-Iaving described the boom and the belt conveyer together with thedischarge carriage and its hopper, the mechanical means for positioningthe carriage and its hopper at any desired point along the boom will nowbe described.

In Fig. '7, it will be noticed that the carriage 9 is provided with tworear arms |08 and I 09 which are oppositely disposed and extendrearwardly and outwardly over the channels of the boom.

Taking up the lower one, Fig. '7, it will be seen that a cable H0 isattached to the eyelet of the arm |08 and then extends rearwardly (Fig.4) to a drum III, which is mounted at the one end of the laterallyextending shaft IIS, which shaft is suitably mounted in the bearings IM.This cable IIO is then threaded about the drum I II and has the otherbight extending forwardly (see Figs. 2 and 9) to a loose pulley II5mounted on the shaft 66 at the forward end of the boom. The cableextends rearwardly again to an arm IIS (Fig. 7) which is secured to theforward end of the carriage B8, which arm is similar to theaforementioned arm |08, the cable being fastened through an eyelet II1on said arm.

In the same manner, there is another arm I I8 at the forward end of thecarriage and on the same side of the carriage as the arm |09, and thereis also a cable II9 secured to the arm |09, which cable extendsrearwardly over the drum mounted on the opposite end of the shaft H3.After being threaded around this drum, the cable extends forwardly ofthe boom and around a loose pulley I2I located on the shaft ES and thenextends rearwardly and is secured to the aforementioned arm II8.

Thus, it will be seen that there are cables extending toward the rear ofthe machine, around drums, and forwardly around pulleys and back to thecarri-age, so that a movement of these drums III and |20 will cause thecarriage to move forwardly or rearwardly, depending on which way thedrums are rotated,

Now to rotate these drums in the desired direction, I provide a faceclutch |22 which consists of the usual oppositely located mitre gearsE23 and |24 with the slip collar |25 disposed therebetween which isrotatively locked to the shaft I I3, and this collar is operated throughthe arm |26 and rod |21, so that the collar may be locked in thewell-known manner to the face of either one of the mitre gears. Thesemitre gears are turned in the opposite direction by the pinion |28located on the stub shaft |29 which, in turn, is provided at its otherend with a pinion I 30 that is rotated by the bevel gear I3I which ismounted on the shaft 36 on which, it will be remembered, is mounted themain driving pulley or drum 31. Therefore, as will be readilyunderstood, whenever the shaft 36 is turning, power may be selectivelyapplied to either one of the mitre gears of the clutch to revolve thedrums II| and ||9 in either one of the two directions to thus drive thecarriage out along the boom or to pull back the carriage to any desiredlocation'on the boom.

It will also be noticed that all of the operations of the endlessconveyer, the discharge carriage, and the traversing of the boom aremechanically operated indirectly from the main drive shaft I3, the onlymanual operation being the elevation or lowering of the boom.

Before describing the complete operation of the conveyer and itscarriage, it might be mentioned that in Fig. 5 there is shown in thesupplemental chute I0 a manually operated gate |32 provided with ahandle |33, which gate is arcuate in shape and provides means forcutting off or o The operation of the boom and its conveyer isexceedingly simple, and presuming that the paver is positioned along asub-grade, if it is desired to move the boom E to the right or left itwill only be necessary to operate the clutch 44 by moving the lever inthe desired direction and power, of course, will be provided from thepower shaft I3 to the shaft 42 to, in turn, rotate the worm |58 which,meshing with the segmental gear 2|, will traverse the boom in thedesired direction.

Inasmuch as the shaft I3 is rotating, it will, through the pinion I5,gear I6, shaft I1, and pinions 3| and 30, drive the main drive shaft 29and through the sprocket 33 and chains 34 drive the rear pulley or drum31. operate the endless conveyer belt 38.

Now supposing that it is desired to run the discharge carriage 9 out toa point near the end of the boom 6, the operator will move the rod |21to selectively turn the drums through the clutch |22 to thus rotate thedrums III and |20 in the desired direction. The cables IIS and I I9threaded about these drums will then take up and pay off and advance orretract the carriage to the desired position, it being remembered thatthe clutch |22, in turn, receives its power from the pinion |28 drivenfrom the pinion I3I on the shaft 35.

After the carriage is in the desired location, and presuming theaggregates are to be dumped to the right of the machine the small gate90 wiil be revolved to the position shown in Fig. 3. Inasmuch as thepower shaft I3 is revolving, the shaft 29 will be revolving, as will beremembered, and also the shaft 36, and the endless conveyer belt will betraveling outwardly and over the rollers or drums mounted on thecarriage 9. Also, the two scrapers, due to their driving means connectedwith the drum on the discharge carriage and the drum on the end of theboom, will be This, in turn, will driven by their chains and sprockets,so that after the batch has been thoroughly mixed in the mixing drum,the drum discharge chute I0 will be opened and the aggregates fedthrough the discharge and supplemental chute I0', and the gate 132,being regulated by the handle |33, will permit the desired amount ofaggregates (not shown) to fall on the endless conveyer belt 38.

The material will travel outwardly Von the belt and then upwardly alongthe discharge carriage, and as the conveyer belt passes over the drum 81the aggregates will fall into the hopper 80 and some will pass directlyout of the branch 82 while others, striking the gate 90, will also bedeflected into the branch B2, and as the conveyer belt continues in itsmotion the concrete will be continuously fed from the chute 82 as fastas it is fed onto the conveyer.

As any given point of the belt passes over the drum 8l, any stickingaggregates will be removed by the revolving scraper |00. The belt thentravels inwardly into the carriage and around its pulley and thenoutwardly to the end of the boom over the drum 65, and as it passesunder the drum it will be brushed by the sprocket driven scraper m2. Thebelt (given point) then returns to the drum 3l at the rear of the boomand then starts out on another cycle.

Of course, the gate Sil can be swung in either direction to dispose ofthe aggregates on either side of the machine, or the gate might be leftin a vertical position to distribute some aggregates on the one side andsome on the other.

It will be understood that it is but the matter `of a moment to move thedischarge carriage along the boom, and this movement can take placeeither while the 'concrete is on the conveyer belt or before theconveyer belt is loaded with the concrete.

From the foregoing, it will be seen that I'have provided means fordistributing the aggregates in a continuous manner at any pointintermediate the ends of the boom.

Inasmuch as the present tendency is to make mixing drums of relativelylarge capacity and as the size of the ordinary bucket used on the boomshas to be of a limited nature, time has been lost while waiting for thereturn of the bucket. Furthermore, when the aggregates are disposed inthe present manner,l they have a tendency to spread further over thesub-grade than where say a cubic yard of concrete is dropped from thebucket at the one time.

Also, by providing mechanically operated Scrapers, one Vlocated at thedischarge carrier hopper and the other out at the end of the boom, thereis no possibility of the aggregates drying on and sticking to theendless conveyer belt.

Finally,it will be seen that all the power neces-Y `claim my inventionbroadly as such, but what I do claim and desire to 'secure by LettersPatent isz- 1. In combination with aconcrete paver, a supporting meansand power transmission located centrally and in front of the paver, anda boom centrally mounted at its one end on said Supporting andtransmission means, means cooperating with the transmission means andwith the boom for selectively traversing the boom in the desireddirection, an endless conveyer belt mounted on the boom, meanscooperable with the transmission mechanism for driving said conveyer,adischarge carriage provided with a hopper mounted on the boom,selective means cooperable with the transmission mechanism for directinga forward or rearward movement of said discharge carriage on said boom,the discharge carriage provided with two rollers, and the conveyer beltpassing over one and under the other and then to the forward end of saidboom whereby material on said conveyer belt will be discharged to saidhopper.

2. In combination with a concrete paver, a supporting means and powertransmission located centrally and in front of the paver, a boomcentrally mounted at its one end on said supporting and transmissionmeans, means cooperating with the transmission means and with the boomfor selectively traversing the boom in the desired direction, an endlessconveyer belt mounted on the boom, means cooperable with the Ytransmission mechanism for driving said conveyer, a discharge carriageprovided with a hopper mounted on the boom, selective means fordirecting a forward or rearward movement of said discharge carriage onsaid boom, cooperable with said transmission mechanism, the dischargecarriage provided with two conveyer rollers, the conveyer belt passingover one and under the other and then to the forward end of said boomwhereby material on said conveyer belt will be discharged into saidhopper.

3. In combination with la concrete paver, a power transmission locatedcentrally in front of the paver, a boom centrally mounted at its oneendon said transmission, means cooperating with the transmission and withthe boom for selectively traversing the boom in any vdesired direction,an endless conveyer belt mounted on the boom, means also cooperable withthe transmission mechanism for driving said conveyer, a dischargecarriage provided with a bifurcated hopper mounted on the boom, theendless conveyer passing over and through said carriage, selective meansalso operable with said transmission for directing a forward or rearwardmovement of the discharge carriage on said boom, and means for directingthe aggregates to either side of the bifurcated hopper after leaving theconveyer.

4. In combination with a concrete paver, a

combined supporting means for the boom and power transmission locatedcentrally in front of the paver, a boom centrally mounted at its one endon said supporting means and power transmission, means cooperating withthe transmission and with the boom for selectively traversing the boominthe desired direction, an endless conveyer belt mounted on the boom,means also cooperable with the transmission mechanism for driving saidconveyer, a discharge carriage mounted on said boom and provided with abifurcated hopper the legs of which extend downwardly from the oppositesides of the boom, the endless conveyer cooperating with the carriage todischarge the contents of the conveyer, selective means also cooperablewith the transmission means for directing a forward or rearward movementof said discharge carriage o-n said boom.

AXEL E. LUNDBYE.

